25561671 has 16 divisors (see below), whose sum is σ = 35856384. Its totient is φ = 16166304.

The previous prime is 25561661. The next prime is 25561681. The reversal of 25561671 is 17616552.

It is an interprime number because it is at equal distance from previous prime (25561661) and next prime (25561681).

It is not a de Polignac number, because 25561671 - 2¹¹ = 25559623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25561621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7305 + ... + 10221.

It is an arithmetic number, because the mean of its divisors is an integer number (2241024).

Almost surely, 2^25561671 is an apocalyptic number.

25561671 is a deficient number, since it is larger than the sum of its proper divisors (10294713).

25561671 is a wasteful number, since it uses less digits than its factorization.

25561671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3070.

The product of its digits is 12600, while the sum is 33.

The square root of 25561671 is about 5055.8551205508. The cubic root of 25561671 is about 294.5753576266.

The spelling of 25561671 in words is "twenty-five million, five hundred sixty-one thousand, six hundred seventy-one".